Light Sensors

  • Most accurate optical sensors in the world for measurement such as radiant, flux, illuminance, and luminous flux
  • A wide range of optical photodiodes sensors and collection optics are available to meet the broad requirements of light analysis.
  • Photodiode sensors include measurement modules for laser power, fiber optic power, illuminance (lux), luminous intensity (candelas), luminous flux (lumens), luminance (nits) and many other applications.
  • ISO17025 accredited calibrations provide expanded uncertainties and traceability to NIST.
  • High performance integrating spheres to complete your light measurement system.
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System Configuration Guide

Learn how to configure a photometer or radiometer system to meet your testing requirements with this free guide from Gamma Scientific.

 

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Guide to Photometry

What’s in the Guide?

  • Definitions of the most important terms in photometry
  • Photometric to radiometric conversion factors
  • How to specify a photometer system
  • Photometric quantity units, symbols and abbreviations

 

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Photometric Sensors

We offer two high-accuracy handheld photometers for use in laboratory settings or field environments. Both instruments are compatible with the full range of UDT Instruments sensor heads and are calibrated in our ISO-17025 accredited laboratory.

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Radiometric Sensors

We offer two high-accuracy handheld photometers for use in laboratory settings or field environments. Both instruments are compatible with the full range of UDT Instruments sensor heads and are calibrated in our ISO-17025 accredited laboratory.

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What is Photometry?

Photometry involves the measurement of electromagnetic radiation in terms of luminous power – that is, its capacity to stimulate the human visual system and to be perceived as light. Different applications require different types of measurements, and therefore, different types of photometric instruments (photometers).

Photometric quantities include: luminous flux – in lumens (lm), luminous intensity (lm/sr), illuminance (lm/m2) and luminance (lm/m2sr).

  • Luminous Flux Measurements (in units of lumens) are performed with a luminous flux meter. This type of testing is typically used for characterizing the total output of sources such as: LEDs, Lamps and Fiber-Optic Illuminators
  • Illuminance Measurements (in units of lux) are performed with a lux meter. This involves the measurement of the amount of luminous flux incident upon a surface, per unit area. Such measurements are important in the following fields: Architectural and Medical
  • Luminous Intensity Measurements (in units of candela) are performed with an instrument that may be described as a luminous intensity meter or a candela meter. This type of testing is typically used for characterizing the output of a relatively small source in a particular direction. Typical devices under test include: LEDs, Automobile Headlamps and Signal Lamps
  • Luminance Measurements (in units of nits, or candela per square meter) are performed with a luminance meter. This involves measuring the light emitted in a particular direction by a given spot on the surface of a relatively large, or extended source. Typical devices under test include: Computer Monitors, Television Screens, Avionics Displays and other Electronic Displays
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